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A combined X-ray diffraction and Raman scattering study of the phase transitions in Sr1−xCaxTiO3 (x=0.04, 0.06, and 0.12)

Autor: Dhananjai Pandey, Sanjay Kumar Mishra, Rajeev Ranjan, J.-P. Pinan-Lucarre, R. Ouillon, P. Ranson, Philippe Pruzan

Publikováno v: Journal of Solid State Chemistry
Journal of Solid State Chemistry, 2005, 178, pp.2846-2857. ⟨10.1016/j.jssc.2005.06.036⟩
Journal of Solid State Chemistry, Elsevier, 2005, 178, pp.2846-2857. ⟨10.1016/j.jssc.2005.06.036⟩

Results of powder X-ray diffraction and Raman scattering studies on the phase transitions in Sr1−xCaxTiO3 (SCT) are presented for x = 0.04 , 0.06 and 0.12 in the temperature range 8–473 K. It is proposed that the space group of SCT in the composi

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::3ee123b00f4be36ce4ce626b8c445e0a
https://doi.org/10.1016/j.jssc.2005.06.036

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Low-temperature Raman spectra of nitromethane single crystals. Lattice dynamics and Davydov splittings

Autor: J.-P. Pinan-Lucarre, P. Ranson, R. Ouillon, Goran Baranović

Publikováno v: The Journal of Chemical Physics. 116:4611-4625

By means of Raman scattering experiment performed on single crystals of solid nitromethane in various polarization geometries at normal pressure and low temperatures, the Davydov splitting of the vibrational levels in the solid phase of hydrogenated

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::81e59f2bbfec03b343c10f155e1a4ccd
https://doi.org/10.1063/1.1451243

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A Raman scattering study of the phase transitions in SrTiO3and in the mixed system (Sr1-xCax)TiO3at ambient pressure fromT= 300 K down to 8 K

Autor: Dhananjai Pandey, Ph. Pruzan, J.-P. Pinan-Lucarre, Rajeev Ranjan, P. Ranson, Sanjay Mishra, R. Ouillon

Publikováno v: Journal of Physics: Condensed Matter. 14:2079-2092

The room-temperature Raman spectra of Sr1-xCaxTiO3 (SCT) for x = 0.06 (SCT06), 0.12 (SCT12) and 0.30 (SCT30) are shown to contain first-order Raman lines corresponding to Eg and B1g modes, which appear below 105 K in pure SrTiO3. The Eg line shows sl

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::17484c1704ec00a99b006e42ebb165eb
https://doi.org/10.1088/0953-8984/14/8/333

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Anharmonicity of zone-centre optical phonons: Raman spectra of the isomorphous ?-quartz, berlinite and gallium phosphate in the temperature range 8-300 K

Autor: J.-P. Pinan-Lucarre, P. Ranson, R. Ouillon

Publikováno v: Journal of Raman Spectroscopy. 31:605-613

The temperature dependence of the optical-phonon wavenumbers and bandwidths in the isomorphous α-quartz, berlinite (AlPO4) and gallium phosphate (GaPO4) was investigated by Raman scattering experiments in the temperature range 8–300 K. Combining t

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::d5764918fc92f96848984387712c240f
https://doi.org/10.1002/1097-4555(200007)31:7<605::aid-jrs583>3.0.co

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Linear wave vector dependence of low-frequency Raman modes in two uniaxial gyrotropic quartz-type materials: α-GaPO4 and α-AlPO4

Autor: R. Ouillon, J.-P. Pinan-Lucarre, P. Ranson

Publikováno v: Chemical Physics Letters. 302:164-170

Linear wave vector dependence of low-frequency E modes was investigated in two quartz-type materials: α-GaPO4 and α-AlPO4. It was found that the splitting of doubly degenerate optical E-modes caused by spatial dispersion is similar to that previous

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::595fcc21a4673247fc61fa9184652c92
https://doi.org/10.1016/s0009-2614(99)00091-3

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